Use 12 jobs instead of 6, now that server is borg-hosted.

Change-Id: Ie3b6baf31d9a4ab8faa961d108555a598158b38b
diff --git a/default.xml b/default.xml
index 2cedbb3..28c6579 100644
--- a/default.xml
+++ b/default.xml
@@ -7,7 +7,7 @@
   <remote
     fetch="https://code.google.com/"
     name="cgc"/>
-  <default remote="gfiber-internal" revision="master" sync-j="6"/>
+  <default remote="gfiber-internal" revision="master" sync-j="12"/>
 
   <project name="manifests" path="manifest"/>
   <project name="toolchains/bruno"/>